Malicious PDF — malware analysis report

Static analysis result for SHA-256 22974c3d3c7f5ca4…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 01:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b28b6f00a4b69243165fee7e36f08917 SHA-1: 37e994a37a85cccb9bcc45553ab92f28b1d677b9 SHA-256: 22974c3d3c7f5ca4ab3235acb320659b5b3fd8ab814e1972454a3c20116a30bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to websites hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://olddieselparts.com/ckfinder/userfiles/files/19371670709.pdf In PDF document text
    • http://wych123.com/upload/files/medomifunejelil.pdfIn PDF document text
    • http://hodori247.com/uploads/files/45751137460.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/87731843274.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/baganonu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/cd11f3244937f9867ae4d09ea855acdb/74182157534.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/94756570252.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/zuwunikasejetokeleb.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16113a5f450cba---vagufefogeso.pdfIn PDF document text
    • http://whatdwellswithin.com/file/25497414666.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85c46f4e0---38613992327.pdfIn PDF document text
    • http://asfalon.com/__files/file/920793108.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/274374736.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4lnu3u885j46o3930ikgiobqkh/bopuzaxanara.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/6851725282.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/bixesopufezukagewalaba.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e689f17872---bowotivudaxavepe.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6cfbd103---66508449424.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/newixipupo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb7d5bce7---metemadezupuwobug.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610c866c74247---95990361978.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/liworivekutaduwanebep.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///41400904741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ajay+bhargav+haryana+gk+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A8 17580 bytes
SHA-256: 7462faf2860cd5bd3f69e16cb6728cea3e57e7017a1cc684fafb1d69b62dd82a
font_01_sfnt_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 10896 bytes
SHA-256: be877e5418ad403bc8117792bfcd13721abb973c30135338b8710656754ab751
font_02_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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